19 May 2015

RUS-ARQ 100Bd/2000

FSK ARQ system 100 Baud and 2000 Hz shift heard this morning (19 May)
on 12129.5 cf starting from 0640, s/off at 0650. It sounds like an ARQ
system, possibly from Russian Governative (then the nickname RUS-ARQ). As far as I know, the
signal is sent by an outstation
to its main 'home' station, that in its turn operates in CIS 3x100 (VFT 3 x
FSK-2 channels) on three correspondents. All these stations (main and
oustations) operate in synchronous mode, usually not far apart in
frequency.